Red-D-Arc D502K 5+4, Technical Manual

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TM-4412 Page 38
D502K 5+4
Trouble Remedy
No auxiliary power output or weld output. Disconnect equipment from auxiliary power receptacles during start-up.
Reset circuit breaker CB12 (see Section 7-8).
Check fuses F1 and F2, and replace if open (see Section 7-8).
Check integrated rectifier SR1, and replace if necessary.
Check capacitor C9, and replace if necessary.
Clean slip rings, and install new brushes if necessary (see Section 10-11).
Disconnect leads 105 and 106 from the rotor, and check continuity across slip rings. Replace rotor if
necessary.
Disconnect stator excitation leads 100 and 101, and check continuity between leads. Replace stator if
necessary.
Check resistance and connections of resistor R3; full resistance of R3 (end to end) is 10 ohms
±
10%.
Replace R3 if necessary. If R3 is replaced, adjust R3 (see Section 10-12).
Check field current regulator board PC1 and connection, and replace PC1 if necessary (see Section
10-7).
High output at auxiliary power
receptacles. Check engine speed, and adjust if necessary (see Section 7-5).
Check resistance and connections of resistor R3; full resistance of R3 (end to end) is 10 ohms
±
10%.
Replace R3 if necessary. If R3 is replaced, adjust R3 (see Section 10-12).
Low output at auxiliary power
receptacles. Check engine speed, and adjust if necessary (see Section 7-5).
Check fuse F1, and replace if open (see Section 7-8).
Check integrated rectifier SR1, and replace if necessary.
Check capacitor C9, and replace if necessary.
Check resistance and connections of resistor R3; full resistance of R3 (end to end) is 10 ohms
±
10%.
Replace R3 if necessary. If R3 is replaced, adjust R3 (see Section 10-12).
C. Engine
Trouble Remedy
Engine will not crank. Check battery, and replace if necessary.
Check battery connections and tighten if necessary.
Circuit breaker CB10 may be open. CB10 automatically resets when fault is corrected (see Section 7-8).
Check engine wiring harness and components.
Check engine wiring harness plug connections.
Check continuity of Engine Start/Preheat switch S1, and replace if necessary.
Engine cranks but does not start. Check fuel level.
Check battery and replace if necessary. Check engine charging system according to engine manual.
Check control relay CR2 for proper coil voltage and connections. Check continuity of coil and condition
of contacts. Replace CR2 if necessary.
Check fuel solenoid FS1 for proper coil voltage and connections. Check continuity of coils. Replace
FS1 if necessary.
Check fuel pump (see engine manual).
Air in fuel system. See engine manual.